305372981 has 2 divisors, whose sum is σ = 305372982. Its totient is φ = 305372980.

The previous prime is 305372933. The next prime is 305373011. The reversal of 305372981 is 189273503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253892356 + 51480625 = 15934^2 + 7175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-305372981 is a prime.

It is a super-2 number, since 2×305372981² = 186505315049652722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305372281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152686490 + 152686491.

It is an arithmetic number, because the mean of its divisors is an integer number (152686491).

Almost surely, 2^305372981 is an apocalyptic number.

It is an amenable number.

305372981 is a deficient number, since it is larger than the sum of its proper divisors (1).

305372981 is an equidigital number, since it uses as much as digits as its factorization.

305372981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 305372981 is about 17474.9243489063. The cubic root of 305372981 is about 673.4058262363.

The spelling of 305372981 in words is "three hundred five million, three hundred seventy-two thousand, nine hundred eighty-one".